Fix that menus didn't show ampersands in files names

And instead interpreted the ampersand + following character as an
accelerator key.

Task-number: QTCREATORBUG-17817
Change-Id: I327239499ce56e75fd12f2df5be60d4b04913acd
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/libs/utils/stringutils.cpp

@@ -375,4 +375,10 @@ int caseFriendlyCompare(const QString &a, const QString &b)
     return a.compare(b, Qt::CaseSensitive);
 }
 
+QString quoteAmpersands(const QString &text)
+{
+    QString result = text;
+    return result.replace("&", "&&");
+}
+
 } // namespace Utils